The material below is Open Game Content from a 3PP Source
Although a violet fungus’s tentacles swiftly grow inert after the mushroom is slain, they can be wielded as Medium-sized whips for 2d6 minutes after being harvested from the creature. These whips inflict rot on anything they touch—including the wielder of the deadly weapon—and both save DCs to resist and effects are identical to the stats presented above.
A DC 25 Craft (alchemy) check and 250 gp worth of reagents can preserve the venom somewhat, although the procedure dilutes it significantly.
Violet Venom: Poison—contact; save Fort DC 13, frequency 1/minute for 6 minutes, effect 1d2 Strength and 1d2 Con damage; cure 1 save; cost 800 gp.